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             <h1 id="sparklines-overview"><a href="#sparklines-overview">Sparklines Overview</a></h1>

<p>The <a href="http://demos.telerik.com/kendo-ui/sparklines/index">Kendo UI Sparklines widget</a> is a very small chart, drawn without axes, coordinates, legends, titles or other chart-specific elements. It behaves like an inline element, as it is rendered inside a <code>span</code>, as opposed to the standard Kendo UI Charts, which behave like block elements, as they are rendered inside <code>div</code> elements, so that it can be easily embedded in text.</p>

<p>Generally, the Sparklines are simple, word-sized graphics that can be embedded in chunks of text, tables, or headlines. The concept for such graphics was developed by <a href="https://en.wikipedia.org/wiki/Edward_Tufte">Edward Tufte</a>.</p>

<p>The Kendo UI Sparklines widget is a version of the Kendo UI Chart widget, tailored for this specific application. While Sparklines are typically line charts, other types are supported as well:</p>

<ul>
<li>  Line (default)</li>
<li>  Bar (Data Bars)</li>
<li>  Column</li>
<li>  Area</li>
<li>  Pie</li>
<li>  Bullet</li>
</ul>

<p>For additional information on new Kendo UI Chart types and features, refer to the <a href="http://www.telerik.com/support/whats-new/kendo-ui-web/roadmap">Kendo UI Roadmap</a>.</p>

<h2 id="getting-started"><a href="#getting-started">Getting Started</a></h2>

<h3 id="create-the-sparklines"><a href="#create-the-sparklines">Create the Sparklines</a></h3>

<p>To create the Sparklines, add an empty <code>span</code> in the HTML, provide it with an ID, and, optionally, set the width and height of the desired chart inline or via CSS, as demonstrated in the example below.</p>

<h6>Example</h6>

<pre><code>&lt;span id="sparkline" style="line-height: 60px"&gt;&lt;/span&gt;
</code></pre>

<blockquote>
<p><strong>Important</strong></p>

<ul>
<li>The width of the line, area, and column Sparklines is determined by the number of data points.</li>
<li>Bar and Bullet graphs have a default width that can be overridden via CSS.</li>
<li>The Pie width equals the line-height to make a square.</li>
</ul>
</blockquote>

<h3 id="initialize-the-sparklines"><a href="#initialize-the-sparklines">Initialize the Sparklines</a></h3>

<p>The Kendo UI Sparklines widget is rendered by selecting the <code>span</code> with a jQuery selector and calling the <code>kendoSparkline()</code> function, as demonstrated below.</p>

<h6>Example</h6>

<pre><code>$("#sparkline").kendoSparkline([1, 2, 3, 2, 1]);
</code></pre>

<h2 id="data-binding"><a href="#data-binding">Data Binding</a></h2>

<p>The Sparklines can visualize series bound to both local and remote data.</p>

<h3 id="bind-to-local-data"><a href="#bind-to-local-data">Bind to Local Data</a></h3>

<p>Binding to local data can be done through:</p>

<ul>
<li>Passing an array with values to the widget constructor.</li>
<li>Setting the root-level <code>data</code> field to an array with values.</li>
<li>Configuring a series and setting its <code>data</code> option.</li>
</ul>

<h6>Example</h6>

<pre><code>// The following configurations are identical

$("#sparkline").kendoSparkline([200, 450, 300, 125]);

$("#sparkline").kendoSparkline({
    type: "line",
    data: [200, 450, 300, 125]
});

$("#sparkline").kendoSparkline({
    series: [{
        type: "line",
        data: [200, 450, 300, 125]
    }]
});
</code></pre>

<h3 id="bind-to-remote-data"><a href="#bind-to-remote-data">Bind to Remote Data</a></h3>

<p>For detailed information on remote data binding, refer to the article on <a href="/controls/charts/data-binding">binding Kendo UI Charts to a Data Source</a>.</p>

<h2 id="axes"><a href="#axes">Axes</a></h2>

<p>The Sparklines widget is a categorical (discrete) chart and has an implicit category and a value axis. The axis orientation (horizontal or vertical) is inferred from the series type.</p>

<h3 id="category-axis"><a href="#category-axis">Category Axis</a></h3>

<p>While category names are not visible by default, they are displayed in tooltips.</p>

<p>The example below demonstrates how to use the <code>categoryAxis</code> object to set the category names.</p>

<h6>Example</h6>

<pre><code>&lt;span id="sparkline"&gt;&lt;/span&gt;
&lt;script&gt;
$("#sparkline").kendoSparkline({
    series: [{
        name: "World",
        data: [15.7, 16.7, 20, 23.5, 26.6]
    }],
    categoryAxis: {
        categories: [2005, 2006, 2007, 2008, 2009]
    }
});
&lt;script&gt;
</code></pre>

<p>The category name can also be bound to a field of the data item.</p>

<h6>Example</h6>

<pre><code>&lt;span id="sparkline"&gt;&lt;/span&gt;
&lt;script&gt;
var internetUsers = [ {
    "country": "United States",
    "year": "2005",
    "value": 67.96
    }, {
    "country": "United States",
    "year": "2006",
    "value": 68.93
}];

$("#sparkline").kendoSparkline({
    dataSource: {
        data: internetUsers
    },
    series: [{
        field: "value",
        name: "United States"
    }],
    categoryAxis: {
        field: "year"
    }
});
&lt;/script&gt;
</code></pre>

<h4>Date display</h4>

<p>The category axis provides built-in support for displaying dates. This includes:</p>

<ul>
<li>Automatic selection of granularity/base unit (minutes, hours, days, etc.)</li>
<li>Label formatting matched to the granularity</li>
<li>Grouping of categories into base units and series aggregates</li>
</ul>

<p>Specifying categories of type <code>Date</code> switches the axis to a date mode. The automatic mode selection can be overridden by specifying <code>type: "Date"</code>.</p>

<h4>Base Units</h4>

<h5>Default configuration</h5>

<p>The default base unit is determined by the smallest duration between categories, as demonstrated in the example below.</p>

<h6>Example</h6>

<pre><code>categoryAxis: {
    categories: [new Date(2005, 0, 1), new Date(2006, 0, 1)]
    // baseUnit is set to "years"
}

categoryAxis: {
    categories: [new Date(2005, 1, 1), new Date(2005, 1, 2)]
    // baseUnit is set to "days"
}
</code></pre>

<h5>Manual configuration</h5>

<p>The <a href="/api/javascript/dataviz/ui/chart#configuration-categoryAxis.baseUnit"><code>base unit</code></a> can also be specified manually. The valid options are:</p>

<ul>
<li>minutes</li>
<li>hours</li>
<li>days</li>
<li>months</li>
<li>years</li>
</ul>

<h4>Series Aggregates</h4>

<p>If more than one category falls within a base unit, then its values are aggregated to display a single point, as demonstrated in the example below.</p>

<h6>Example</h6>

<pre><code>&lt;span id="sparkline"&gt;&lt;/span&gt;
&lt;script&gt;
$("#sparkline").kendoSparkline({
    series: [{
        type: "column",
        data: [20, 40, 45, 30, 50]
    }],
    categoryAxis: {
        categories: [
            new Date("2011/12/30"),
            new Date("2011/12/31"),
            new Date("2012/01/01"),
            new Date("2012/01/02"),
            new Date("2012/01/03")
        ]
    }
});
&lt;/script&gt;
</code></pre>

<p>This code results in the following Sparklines. Note that values are displayed as are.</p>

<p><strong>Figure 1: Sparklines with a date category axis</strong></p>

<p><img src="/controls/charts/sparkline/sparkline-category-date-axis.png" alt="Sparkline with date category axis"></p>

<p>The example below demonstrates the Sparklines with its base unit changed to <code>"years"</code>.</p>

<h6>Example</h6>

<pre><code>categoryAxis: {
    baseUnit: "years",
    categories: [
        new Date("2011/12/30"),
        new Date("2011/12/31"),
        new Date("2012/01/01"),
        new Date("2012/01/02"),
        new Date("2012/01/03")
    ]
}
</code></pre>

<p>Notice below how the Sparklines display the maximum value for each year.</p>

<p><strong>Figure 2: Sparklines with a grouped date category axis</strong></p>

<p><img src="/controls/charts/sparkline/sparkline-category-date-axis-grouped.png" alt="Sparkline with grouped date category axis"></p>

<p>The aggregate function can be changed for each series, as demonstrated below.</p>

<h6>Example</h6>

<pre><code>series: [{
    aggregate: "sum",
    type: "column",
    data: [20, 40, 45, 30, 50]
}]
</code></pre>

<p>The available options are:</p>

<ul>
<li><code>min</code></li>
<li><code>max</code></li>
<li><code>count</code></li>
<li><code>sum</code></li>
<li><code>avg</code></li>
<li>
<code>function</code> (values, series) (Custom aggregate)</li>
</ul>

<h3 id="value-axis"><a href="#value-axis">Value Axis</a></h3>

<p>The Sparkline currently supports only Numeric value axes.</p>

<p>Configuration options are accessible through the <a href="/api/dataviz/sparkline#valueaxis-object"><code>valueAxis</code> object</a>:</p>

<pre><code>&lt;span id="sparkline"&gt;&lt;/span&gt;
&lt;script&gt;
$("#sparkline").kendoSparkline({
    series: [{
        name: "World",
        data: [15.7, 16.7, 20, 23.5, 26.6]
    }],
    valueAxis: {
        min: 0,
        max: 100
    },
    categoryAxis: {
        categories: [2005, 2006, 2007, 2008, 2009]
    }
});
&lt;/script&gt;
</code></pre>

<p>Here we have configured a Numeric axis with a minimum value of 0 and a maximum value of 100.</p>

<h4>Plot Bands</h4>

<p>Each axis can be configured to display bands with different colors for predefined value ranges. The category index (zero based) is used as a value for the category axis, as demonstrated in the example below.</p>

<h6>Example</h6>

<pre><code>&lt;span id="sparkline"&gt;&lt;/span&gt;
&lt;script&gt;
$("#sparkline").kendoSparkline({
    data: [15.7, 16.7, 20, 23.5, 26.6],
    valueAxis: {
        plotBands: [{
            from: 0,
            to: 20,
            color: "#f99"
        }]
    }
});
&lt;/script&gt;
</code></pre>

<h2 id="see-also"><a href="#see-also">See Also</a></h2>

<p>Other articles on Kendo UI Charts and chart types:</p>

<ul>
<li><a href="/controls/charts/overview">Overview of the Chart Widgets</a></li>
<li><a href="/controls/charts/series">Data Series Charts</a></li>
<li><a href="/controls/charts/chart-types/area-charts">Area Charts</a></li>
<li><a href="/controls/charts/chart-types/bar-charts">Bar Charts</a></li>
<li><a href="/controls/charts/chart-types/bubble-charts">Bubble Charts</a></li>
<li><a href="/controls/charts/chart-types/funnel-charts">Funnel Charts</a></li>
<li><a href="/controls/charts/chart-types/line-charts">Line Charts</a></li>
<li><a href="/controls/charts/chart-types/pie-charts">Pie Charts</a></li>
<li><a href="/controls/charts/chart-types/scatter-charts">Scatter Charts</a></li>
<li><a href="/controls/charts/stockchart/overview">Stock Charts</a></li>
<li><a href="/controls/charts/treemap/overview">TreeMap</a></li>
<li><a href="/api/javascript/dataviz/ui/sparkline">Sparklines JavaScript API Reference</a></li>
</ul> 
        </article>
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